Bank-driven model for preventing double spending of digital currency transferred between multiple DLT networks using a trusted intermediary

Patent metadata

Field	Value
Publication number	US-11983705-B1
Application number	US-202217870500-A
Country	US
Kind code	B1
Filing date	Jul 21, 2022
Priority date	Feb 19, 2020
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

A method for preventing the double-spending of digital currency that transfers between multiple distributed ledger technology (DLT) networks. The method includes receiving a message including a smart contract and executing the smart contract. The method further includes detecting a transaction request to transfer the first digital currency from the first DLT network to the second DLT network. The method further includes destroying the digital currency and creating, based on the unit of fiat currency, a second digital currency of a second type on the second DLT network. The method further includes transferring, responsive to detecting the transaction request, the first digital currency from the first DLT network to the second DLT network.

First claim

What is claimed is:

1. A method, comprising:
receiving, by a node of a first distributed ledger technology (DLT) network of a first type, a first message including a smart contract;
executing, by the node of the first DLT network, the smart contract;
detecting, by the node of the first DLT network and via the smart contract, a transaction request to transfer a digital currency from the first DLT network to a second DLT network of a second type;
receiving, by the node of the first DLT network, a second message from an exchange node indicating that the digital currency is to be destroyed;
in response to receiving the second message, destroying, by the node of the first DLT network, the digital currency;
creating, by the node of the first DLT network and based on a unit of fiat currency, a second digital currency of a second type on the second DLT network; and
transferring, by the node of the first DLT network, the digital currency from the first DLT network to the second DLT network via the exchange node;
wherein the exchange node is separate from the first DLT network and the second DLT network.

2. The method of claim 1 , further comprising:
sending, by the node of the first DLT network via the exchange node and responsive to transferring the first digital currency from the first DLT network to the second DLT network, a confirmation request to the second DLT network; and
receiving, by the node of the first DLT network via the exchange node, the confirmation from the second DLT network indicating whether the transfer of the first digital currency from the first DLT network to the second DLT network has completed.

3. The method of claim 2 , wherein the confirmation is received in response to the second DLT network searching the second DLT network for the second digital currency associated with the serial number.

4. The method of claim 1 , wherein detecting the transaction request comprises:
receiving, by the node of the first DLT network via the exchange node, the transaction request from the first DLT network or the second DLT network.

5. The method of claim 1 , wherein creating the second digital currency of the second type on the second DLT network comprises:
attaching, by the node of the first DLT network via the exchange node, a serial number to the second digital currency.

6. The method of claim 1 , wherein the first digital currency is associated with a created state or destroyed state and the second digital currency is associated with the other of the created state or the destroyed state.

7. The method of claim 1 , wherein the first digital currency of the first type and the second digital currency of the second type are different types of digital currency.

8. The method of claim 1 , wherein the node of the first DLT network detects the transaction requests associated with the first DLT network via the execution of the smart contract installed on the first DLT network.

9. A system, comprising:
a processing circuit configured to:
receive a first message including a smart contract;
execute the smart contract;
detect a transaction request to transfer a digital currency from a first distributed ledger technology (DLT) network of a first type to a second DLT network of a second type;
receive a second message from an exchange node indicating that the digital currency is to be destroyed;
in response to receiving the second message, destroy the digital currency;
create a second digital currency of a second type on the second DLT network based on a unit of fiat currency; and transfer the digital currency from the first DLT network to the second DLT network via the exchange node;
wherein the exchange node is separate from the first DLT network and the second DLT network.

10. The system of claim 9 , wherein the processing circuit is further configured to:
send, via the exchange node and responsive to transferring the first digital currency from the first DLT network to the second DLT network, a confirmation request to the second DLT network; and
receive, via the exchange node, the confirmation from the second DLT network indicating whether the transfer of the first digital currency from the first DLT network to the second DLT network has completed.

11. The system of claim 10 , wherein the confirmation is received in response to the second DLT network searching the second DLT network for the second digital currency associated with the serial number.

12. The system of claim 9 , wherein the processing circuit is further configured to:
prevent, via the exchange node, a coexistence of the first digital currency on the first DLT network and the second digital currency on the second DLT network.

13. The system of claim 9 , wherein the processing circuit is further configured to:
receive, via the exchange node, the transaction request from the first DLT network or the second DLT network.

14. The system of claim 9 , wherein the processing circuit is further configured to: attach, via the exchange node, a serial number to the second digital currency.

15. The system of claim 9 , wherein the first digital currency is associated with a created state or destroyed state and the second digital currency is associated with the other of the created state or the destroyed state.

16. The system of claim 9 , wherein the first digital currency of the first type and the second digital currency of the second type are different types of digital currency.

17. One or more non-transitory computer-readable storage media having instructions stored thereon that, when executed by a plurality of processing circuits, cause the plurality of processing circuits to:
receive a first message including a smart contract;
execute the smart contract;
detect a transaction request to transfer a digital currency from a first distributed technology ledger (DLT) network of a first type to a second DLT network of a second type;
receive a second message from an exchange node indicating that the digital currency is to be destroyed;
in response to receiving the second message, destroy the digital currency;
create a second digital currency of a second type on the second DLT network based on a unit of fiat currency; and
transfer the digital currency from the first DLT network to the second DLT network via the exchange node;
wherein the exchange node is separate from the first DLT network and the second DLT network.

Assignees

• Wells Fargo Bank Na

Inventors

• Shetti Abhijit
• Fontana Laura Marie
• Bhaskarketharaju Rameshchandra B
• Garner Iv Andrew J
• Stroke Nikolai
• Trinh Duc
• Oza Mabel
• Biggs Todd

Classifications

• G06Q20/3678 Primary

  e-cash details, e.g. blinded, divisible or detecting double spending · CPC title

• G06Q20/0658

  e-cash managed locally · CPC title

• G06Q20/3672

  initialising or reloading thereof · CPC title

• G06Q20/405

  Establishing or using transaction specific rules · CPC title

• G06Q20/065 Primary

  using e-cash · CPC title